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TMC ENGINEERS INC. <br />Geotechnical, Structural and Civil Engineering <br />Add: 9542 Pacific Ave, Anaheim, CA92804. Phone: 714-829-5053; Email: Tienchu.pe@gmail.com <br /> <br />Page 6 <br /> <br /> <br />5.0 SEISMIC HAZARDS <br />5.1 Liquefaction Potential <br />Liquefaction is the transformation of a granular material from a solid to a liquid state as a result <br />of as flow land sliding, lateral spread, loss of bearing capacity, or settlement. <br />Based on the Seismic Hazard Zones Map, Newport Beach Quadrangle, the site is located <br />within a potential liquefaction zone. Therefore, liquefaction may occur at the site, and the <br />property owner(s) should be aware of the risks associated with being in a potential liquefaction <br />zone. We recommend the proposed new structures should have a strengthened footing <br />system as recommended in this report, and the proposed new structures will be designed <br />based on up-to-date building codes to reduce the potential adverse effects due to potential <br />liquefaction increasing pore-water pressure. The material will then lose strength and can flow <br />if unrestrained, thus leading to ground failure. Liquefaction can be triggered in saturated <br />cohesionless material by short-term cyclic loading, such as shaking due to an earthquake. <br />Ground failure that results from liquefaction can be manifested to the proposed new structures. <br />It should be recognized that structural mitigation may not reduce the potential of the soils to <br />liquefy during an earthquake; and there will remain some risks that the structure could still <br />suffer damage if liquefaction occurs during a very strong earthquake. <br />Differential settlement due to liquefaction may occur, to reduce the potential adverse effect to <br />the proposed new structural due to potential liquefaction induced differential settlement and/or <br />reduction in soil bearing capacity, and it is our opinion that our recommendations shall satisfy <br />the liquefaction requirements. <br />5.2 Lurching <br />Soil lurching refers to the rolling motion on the surface due to the passage of seismic surface <br />waves. Effects of this nature are not considered significant on the subject site where the <br />thickness of alluvium does not vary appreciably under structures. <br />5.3 Surface Rupture <br />FLOOD ZONE - 718 S <br />Flintridge Dr Unit# 23/26/2025